Safety razor



B. ASTRM SAFETY RAZOR Nov. 6, 1934.

' Filed 001;. 5, 1955 j (4j (dr-C@ Patented Nov. 6, 1934 UNITED srArs P negozi SAFETY RAZOR Bertil strm, Domnarvet, Sweden Application October 3, 1933, Serial No. 692,023

In Sweden October'S, 1932 6 Claims. (Cl. Eli-df! This invention refers to a safety razor` having a guard plate on its cutting edge.

The chief object of this invention is to create a simple and non-expensive safety razor uniting the advantages of the ordinary or knife razor and those of the so-called safety razors, while eliminating the disadvantages of the Another object of this inventi known razors. on is to use, in a blades.

Another object of this invention is to render it possible to remove or to insert the blade in one single operation, i. e. in one single manipulative step. In one preferred embodiment it is only necessary to turn a nut to permit the blade to be drawn out, while the non-cutting parts remain as a single, assembled'aggregate A further object of this invention is to construct the safety razor in such blade is always automatically exactly centered and kept in its correct position.

A further object of this invention is to construct manner that the a safety razor without any clamping plate on the blade, so that the razor has only a comb-shaped safety plate or guard below the blade.

A further object of this invention is to construct a safety razor having a plane carrier plate or guard, and also a plane rigid cutting blade.`

Further objects will be evident from the following specification.

One embodiment of this invention is shown in the annexed drawing.

Fig. 1 shows a partial end View of a safety razor in accordance with this invention, some parts being cut away.

Fig. 2 is a top view of the razor. Fig. 3 is a plan view, in which the back side of the blade is turned upwards.

Fig. 4 shows an end view of the blade. Fig. 5 is a plan View of the blade.

Fig. 6 shows the carrier plate of which a part is cut away.

Fig. 8 shows the fixing bolt. view of a modified embodiment and the handle,

Fig. 7 shows a top view of the carrier plate.

Fig. 9 is a detail of the bolt head.

Referring now to the drawing 1 indicates the A carrier plate or guard is comb-shaped (toothed), as usual in safety razors, has a plane upper side and lis provided with a tubular handle 3 rigidly secured thereto and, preferably, integral therewith. Throughvthe hole 5 of said handle a I Y bolt 4 is inserted having a conical head lla. At its 60 opposite end said bolt is provided with threads 4b to receive a nut 6 which may be milled. Said nut abuts against the free (lower) end of the handle 3.

At its ends the carrier plate 2 is provided with '5` recesses 7 to facilitate the removal and the insertion of the blade. At that edge'which is opposite to the comb 2a said plate 2 is provided with projections 8.

The side la of the blade 1 abutting against the plane upper side of the carrier plate 2 is plane and the blade is chainfered or bevelled at 1b so as to form a cutting edge 1c. At its back side 1d opposite to the cutting edge lc said blade is provided with two' recesses le at each end and further with a slot if whose inner circular edge 1g is to register with the hole 5 and the bolt ll, when the blade is mounted ready for use. Said circular edge 1g of the slot 1f is chamfered conically or counter-sunk as shown at 1h and further the straight edges of said slot 1f are bevelled or chamfered as shown at 17'. The bevelling 17' may be dispensed with, if desired.

In the assembled safety razor as shown in Figs. 1-3 the plane side la of the cutting blade l lies upon the plane upper side of the carrier or safety plate 2 in such manner that the cutting edge 1c extends across the comb-shaped edge 2a of said carrier plate. yThe recesses 1e of the blade then abut against the projections 8 of the carrier plate 2 and the conical head 4d of the bolt is counteresunk into the conical recess 1h of the slot 1f, thus co-operating with the projections 8 to centre and nx the blade 1 exactly in its correct position.

Because of the thickness and rigidity of the blade 1 said blade will not vibrate at the shavein strict contrast to the common safety razors having thin clamped blades. Furthermore, the angle between the blade andthe skin will be the same as in using ordinary (knife) razors, but will be different from that between the skin and the thin curved clamped blade of the ordinary safety razors. This results in a very efcient and painless shave while simultaneously 105 the safety plate 2 prevents the skin from being cut. Because the blade 1 is thick and rigid its cutting edge will remain sharp during a very long time, far longer than the time that the ordinary thin safety razor blades are serviceable. 110

To remove the blade after shave it is only necessary to turn the nut 6 a` little so that the blade can be drawn out in the direction to the combshaped edge 2a of the carrier plate 2, i. e. in the direction of the arrow A. The bolt 4 and nut 6 remain in their places and need not be removed. The only part to be removed is the blade which must be dried on a towel or the like, while the other parts, i. e. the carrier plate 2, the handle 3, the bolt 4 and the nut 5, which form an always united aggregate may be made of a stainless (non-corroding) material and, therefore, after washing may be left to dry in the air. The recesses 7 give room for the fingers and thus facilitate the removal and the insertion of the blade. The bevelling 17 of the straight edges of the slot 1f reduces the turning (i. e. the angle of rotation) of the nut 6 necessary to permit the blade l to be drawn out. If said bevelling is dispensed with it is necessary to turn the nut 6 a greater number of turns than otherwise.

To re-insert the blade it is only necessary to push it inwards on the carrier plate 2 and to tighten the nut 6 again. The conical head of the bolt 4 will co-operate with the conical countersink 1h to centre the blade exactly in relation to the handle and to press the recesses le tightly against the projections 8. Thus, the blade Will always be automatically placed inrits exact position and rigidly and` safely secured. It is evident that the removal or the insertion of the blade may be made in one single operation, i. e. by one single manipulation.

The mounting and dis-mounting of the blade is, thus, much simpler than in the ordinary safety razors, in which the parts must be entirely dis-assembled to permit the blade to be withdrawn from the clamping members.

In the modied embodiment shown in Fig. 9

, the head 4a. of the bolt 4 is provided with a through said blade and said handle to secure said blade to said carrier plate, a conical head on said bolt adapted to be received in said countersunk portion, and releasable means to press said conical head against said blade.

2. In a safety razor, in combination, a carrier plate, a handle secured to said carrier plate, a rigid cutting blade having a slot with bevelled conical edges at its innermost end, a bolt extending through said blade, said plate and said handie, a conical head on said bolt adapted to be received in said conical end of said slot, and releasable means to press said conical head against said conical end of said slot.

3. In a safety razor, in combination, a carrier plate, a handle secured to said carrier plate, a toothed edge on said carrier plate, separate projections at the two ends of that edge of said carrier plate which is opposite to said toothed edge, a rigid cutting blade having a slot and also recesses in that edge which is opposite to its cutting edge to accommodate said projections, said slot having ,a conically countersunk portion, a bolt extending through said blade, said plate and said handle, a conical head on said bolt adapted to be received in said conically countersunk portion, and releasable means to press said conical head into said conically counter-sunk portion.

4. In a safety razor, in combination, a carrier plate, a tubular handle secured to said plate, a rigid cutting blade having a slot whose inner end is conically countersunk and whose straight edges are bevelled, a bolt extending through said slot, said plate and said handle, a conical head on said bolt adapted to be received into said countersunk portion, and releasable means for pressing said head into said counter-sunk end oi" said slot.

5. In a safety razor, in combination, a carrier plate, a tubular handle secured to said plate, a rigid cutting blade having a slot whose inner end is conically countersunk and whose straight edges are bevelled, a bolt extending through said slot, said plate and said handle, a conical head on said bolt adapted to be received into said countersunk portion, a projection from said conical head to be received between the straight edges of said slot, and releasable means for pressing said head and said projection into said slot.

6. In a safety razor, in combination, a carrier plate, a tubular handle secured to said plate, a rigid cutting blade having a slot with a conically countersunk portion and bevelled straight edges, a bolt extending through said slot, said plate and said handle, a conical head on said bolt adapted to be received into said counter-sunk portion, a projection from said conical, head, said projection having bevelled edges and adapted to be received between the straight edges of said slot, and releasable means for pressing said head and said projection into said slot.

BERTIL STRM. 

